WordPress NeoBeat theme <= 1.7 - PHP Object Injection vulnerability

Vulnerability

The WordPress NeoBeat theme versions 1.7 and earlier are vulnerable to an unauthenticated PHP Object Injection. The vulnerability resides in how the theme deserializes user-supplied input without proper validation or sanitization. An attacker can inject arbitrary PHP objects by sending a crafted serialized payload to the affected endpoint, which can lead to various severe outcomes if a suitable POP (Property Oriented Programming) chain exists in the application environment [1].

Exploitation

An unauthenticated attacker can exploit this vulnerability without any prior authentication or user interaction. The attacker sends a specially crafted HTTP request containing a malicious serialized PHP object to a vulnerable endpoint of the NeoBeat theme. The request is processed by the theme, which deserializes the payload, triggering the POP chain if available. No special network position or privileges are needed beyond standard internet access [1].

Impact

Successful exploitation can lead to code injection, SQL injection, path traversal, denial of service, and other attacks, depending on the available POP chain. The impact is potentially severe as the attacker could execute arbitrary code on the server, read sensitive files, or manipulate the database. This vulnerability is considered highly dangerous and is expected to be used in mass-exploit campaigns targeting thousands of websites [1].

Mitigation

The vulnerability is fixed in version 1.8 of the theme. Users are advised to update to version 1.8 or later immediately. If updating is not possible, Patchstack provides a virtual patching rule to block attacks until the theme is updated. As this vulnerability is expected to be actively exploited, taking prompt action is critical [1].